US4606767A - Decorative silver-colored sintered alloy - Google Patents

Decorative silver-colored sintered alloy Download PDF

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Publication number
US4606767A
US4606767A US06/791,940 US79194085A US4606767A US 4606767 A US4606767 A US 4606767A US 79194085 A US79194085 A US 79194085A US 4606767 A US4606767 A US 4606767A
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weight
sintered alloy
present
silver
nickel
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US06/791,940
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English (en)
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Yoshio Nagato
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Kyocera Corp
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Kyocera Corp
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Assigned to KYOCERA CORPORATION, 5-22, KITA INOUE-CHO, HIGASHINO, YAMASHINA-KU, KYOTO-SHI, JAPAN, A CORP OF JAPAN reassignment KYOCERA CORPORATION, 5-22, KITA INOUE-CHO, HIGASHINO, YAMASHINA-KU, KYOTO-SHI, JAPAN, A CORP OF JAPAN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: NAGATO, YOSHIO
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C29/00Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/10Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on titanium carbide

Definitions

  • the present invention relates to an improvement in a decorative silver-colored sintered alloy comprising titanium carbide (TiC) as the main component. More particularly, the present invention relates to a sintered alloy which has a high corrosion resistance and is excellent in the property of manifesting a smooth mirror surface having a deep silver color. Furthermore, the present invention relates to a process for the preparation of this sintered alloy.
  • TiC titanium carbide
  • a sintered alloy comprising TiC as the main component and a binder metal selected from Fe, Co, Ni, Mo, W and Ti is broadly used as a decorative material because it has a silver color and is excellent in such properties as the hardness and strength.
  • the above-mentioned sintering aid is a metal element, corrosion of the metal component present in the sintered alloy is advanced and the color of the decorative member is readily degraded by sweat or the like.
  • the sintering aid especially the metal of the iron group, has no saitsfactory wettability with TiC, and therefore, many voids or pores appear throughout the crystals and grain boundaries in the sintered body, and even if mirror polishing is carried out, a smooth and deep mirror surface cannot be manifested.
  • a decorative silver-colored sintered alloy which comprises titanium carbide, chromium carbide and nickel, wherein titanium carbide is present in the form of the dispersed phase of particles in an amount of 50 to 98% by weight based on the three components, and chromium and nickel are present in the form of the binder phase of a solid solution in amounts of 1 to 20% by weight and 1 to 30% by weight, respectively, based on the three components.
  • a process for the preparation of a decorative silver-colored sintered body which comprises homogeneously mixing titanium carbide powder, chromium carbide powder and nickel powder in amounts of 50 to 98% by weight, 1 to 20% by weight and 1 to 30% by weight, respectively, based on the three components, compression-molding the powdery mixture in a predetermined shape, and sintering the molded body in a non-oxidizing atmosphere or in vacuum at a temperature of 1300° to 1600° C.
  • the sintered alloy of the present invention is in agreement with the conventional sintered alloys in that titanium carbide is the main component, but the sintered alloy of the present invention is prominently characteristic over the conventional sintered alloys in that chromium carbide is selected among carbides and incorporated in an amount of 1 to 20% by weight, preferably 5 to 15% by weight, based on the three components and nickel (Ni) is selected among binder metals and incorporated in an amount of 1 to 30% by weight, preferably 5 to 20% by weight, based on the three components.
  • nickel as the binder metal is molten and sintering is advanced.
  • the wettability of titanium carbide with the molten metal is poor and many pores are contained in the formed sintered body, and dents are formed on the mirror surface and the surface gloss is dull and somber.
  • corrosion of the metal is readily advanced by the local cell action between the binder metal and the titanium carbide particles.
  • Chromium carbide used in the present invention exerts the function of improving the wettability of the surfaces of titanium carbide particles with the molten metal, and chromium carbide reacts with the molten metal to form a nickel/chromium alloy excellent in the corrosion resistance in the binder metal phase. Accordingly, a sintered body having a very low pore content can be obtained according to the present invention and a smooth mirror surface having a deep silver color can be formed, and furthermore, the corrosion resistance of the sintered body is prominently improved. In order to form a phase of this nickel/chromium alloy, it is important that nickel should be used as the binder metal.
  • the sintered alloy of the present invention has the above-mentioned micro-structure can be easily confirmed by the analysis using an X-ray microanalyzer.
  • titanium carbide is present in the form of the dispersed phase of particles and the nickel metal forms the grain boundary phase as the binder phase.
  • the dispersed particles of titanium carbide have a size of 3 to 4 ⁇ m. All the chromium atom of chromium carbide (Cr 3 C 2 ) substitutes for the nickel atom in the nickel metal crystal of the grain boundary phase of nickel and all the carbon atom of chromium carbide is included in the nickel metal crystal, with the result that a solid solution is formed. If the carbon atom is thus included in the nickel metal crystal phase, the melting point of the nickel binder phase is lowered and hence, the sintering temperature can be lowered.
  • the pore content is drastically reduced.
  • the reason is considered to be that the wettability of titanium carbide with the binder phase is improved by the above-mentioned micro-structure of the nickel binder phase and the sintering temperature is lowered.
  • Chromium carbide has ordinarily a composition of Cr 3 C 2 , and chromium carbide having this composition is preferably used. However, Cr 7 C 3 and Cr 23 C 6 may be used singly or in combination with Cr 3 C 2 .
  • the above-mentioned three components should be used in specific amounts. If the amount incorporated of chromium carbide is smaller than 1% by weight, the wetting property of the metal element of TiC is not improved and the corrosion resistance is not highly improved. On the other hand, if the amount of chromium carbide is larger than 20% by weight, the sintered body becomes reddish and is not suitable as a silver-colored decorative material.
  • the reason why the amount added of nickel is specified in the present invention is that if the amount of nickel is smaller than 1% by weight, the sintering property is degraded and a dense sintered body having a sufficient strength cannot be obtained and if the amount of nickel is larger than 30% by weight, the corrosion resistance is degraded.
  • titanium carbide should be contained in the sintered body in an amount of at least 50% by weight, especially 50 to 98% by weight. If the amount of titanium carbide is smaller than 50% by weight, the color of the sintered body is dull silver and the sintered body is not suitable as a silver-colored decorative material. It is preferred that the amount of titanium carbide be at least 65% by weight, especially 65 to 90% by weight. Incidentally, a desirable hue can be obtained by changing the mixing ratio of each component within the above-mentioned range.
  • the sintered alloy of the present invention is different from the conventional sintered alloys in several points.
  • the sintered alloy comprising a nickel/chromium carbide solid solution as the binder
  • a sintered alloy of the TiN--Ni--Cr 3 C 2 system As the sintered alloy comprising a nickel/chromium carbide solid solution as the binder, there is known a sintered alloy of the TiN--Ni--Cr 3 C 2 system. This sintered alloy is gold-colored.
  • the sintered alloy of the present invention is silver-colored and is different from this known sintered alloy in the hue.
  • the wet angle of TiC to the binder is about 15° while the wet angle of TiN to the binder is about 113°, and the wettability is highly improved in the composition of the present invention.
  • the sintering property is much better than in the conventional composition, and sintering at a lower temperature becomes possible.
  • sintering is possible at a temperature lower by about 100° C. than in the composition comprising TiN.
  • both the sintered alloys are different in the hardness of the main component used as the hard phase. Namely, the hardness (Hv) of TiN is 2050, while the hardness (Hv) of TiC is 3257. In the sintered bodies, the hardness (Hv) of TiN is 1000 to 1200, while the hardness (Hv) of TiC is 1500 to 2000.
  • the sintered alloy of the present invention comprises the above-mentioned three components as indispensable components. Incorporation of other components is not excluded from the scope of the present invention.
  • a part of chromium carbide may be substituted by a small amount of other carbide such as niobium carbide, and a part of metallic nickel may be substituted by other binder metal such as cobalt.
  • the particle sizes of starting powders of titanium carbide, chromium carbide and nickel metal may be smaller than 2.0 ⁇ m, preferably smaller than 1.0 ⁇ m.
  • chromium carbide and nickel are added to the starting powder of chromium carbide and they are homogeneously mixed, and the mixture was compression-molded and sintered. If sintered is carried out at a temperature of 1300° to 1600° C., especially 1350° to 1450° C., in a furnace of a non-oxidizing atmosphere such as nitrogen or argon or in a vacuum furnace (the vacuum degree of 10 -2 to 10 -5 Torr), there is obtained a decorative silver-colored sintered alloy which is excellent in the corrosion resistance and has a smooth mirror surface having a good deepness.
  • the so-obtained sintered alloy was mirror-polished, and the hue, specific gravity, flexural strength, Vickers hardness (Hv) and corrosion resistance were examined.
  • the flexural strength was measured by the three-point bending method of JIS R-1601, and the Vickers hardness was determined according to the method of JIS Z-2244.
  • the corrosion resistance was determined by the sweat resistance test where a sample was immersed in an artificial sweat prepared from standard components of human sweat and the salt spray test where saline solution (4% w/v) was atomized and sprayed on a sample (JIS Z-2371).
  • a polished sintered alloy was prepared in the same manner as described in Example 1 except that a composition comprising 82.5% by weight of TiC, 10% by weight of Cr 3 C 2 and 7.5% by weight of Ni was used.
  • the characteristics of the sintered alloy were determined in the same manner as described in Example 1. It was found that the apparent specific gravity was 5.3, the flexural strength was 110 kg/mm 2 , the hardness (Hv) was 1900 kg/mm 2 , discoloration or corrosion was not observed at the corrosion resistance test, and the hue was silver.
  • the decorative silver-colored sintered alloy of the present invention has practically satisfactory hardness and strength and is capable of manifesting a mirror surface having a deep silver color excellent in the corrosion resistance, and therefore, a high decorative effect can be maintained for a long material. Accordingly, the sintered alloy of the present invention can be advantageously used as a wall material, a watch case, a brooch, a commemoration medal, a button, a bracelet, a ring, a pendant and the like.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
US06/791,940 1984-10-30 1985-10-28 Decorative silver-colored sintered alloy Expired - Lifetime US4606767A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP59229894A JPS61106743A (ja) 1984-10-30 1984-10-30 装飾用銀色焼結合金
JP59-229894 1984-10-30

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JP (1) JPS61106743A (fr)
CH (1) CH665224A5 (fr)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4770701A (en) * 1986-04-30 1988-09-13 The Standard Oil Company Metal-ceramic composites and method of making
US5403374A (en) * 1991-05-31 1995-04-04 Sumitomo Electric Industries, Ltd. Watch exterior parts and manufacturing method thereof
US5901379A (en) * 1997-07-31 1999-05-11 Phild Co., Ltd. Health bands
US6306196B1 (en) * 1999-08-04 2001-10-23 Hitachi Metals, Ltd. Sintered Ti-system material product derived from injection molding of powder material and producing method thereof
US20040231459A1 (en) * 2003-05-20 2004-11-25 Chun Changmin Advanced erosion resistant carbide cermets with superior high temperature corrosion resistance
US20090129961A1 (en) * 2007-11-15 2009-05-21 Viper Technologies Llc, D.B.A. Thortex, Inc. Metal injection molding methods and feedstocks
US8124187B2 (en) 2009-09-08 2012-02-28 Viper Technologies Methods of forming porous coatings on substrates
US20140162864A1 (en) * 2012-05-09 2014-06-12 Michelene Hall Metal detectible ceramic tooling
US9815743B2 (en) 2012-05-09 2017-11-14 Michelene Hall Metal detectible ceramic material and method for making the same
US10710933B2 (en) 2012-05-09 2020-07-14 Thomas Blaszczykiewicz Cermet body
US10865149B2 (en) 2012-05-09 2020-12-15 Thomas Blaszczykiewicz Metal-detectable plastic material
US11225704B2 (en) 2012-05-09 2022-01-18 Thomas Blaszczykiewicz Cermet body
CN115710666A (zh) * 2022-10-19 2023-02-24 中南大学 一种含碳化铬包覆碳化钛的镍基复合涂层及其制备方法
US11958262B2 (en) 2019-03-28 2024-04-16 Innex Innovative Industries Cermet tooling with a plastic support structure
US12187004B2 (en) 2019-03-28 2025-01-07 Innex Innovative Industries Composite tooling assembly
US12496795B2 (en) 2019-03-28 2025-12-16 Innex Innovative Industries Composite tooling assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1961468A (en) * 1930-01-03 1934-06-05 Richard R Walter Sintered alloy
US2765227A (en) * 1950-12-16 1956-10-02 Sintercast Corp America Titanium carbide composite material
US3552937A (en) * 1968-02-10 1971-01-05 Tokyo Shibaura Electric Co Sintered alloys of a chromium carbide-tungsten carbide-nickel system
US3890105A (en) * 1972-04-27 1975-06-17 Bluecher Wahlstatt Leichtmet Metallic sintering powder or alloy
US3964878A (en) * 1973-06-06 1976-06-22 Gte Sylvania Incorporated Cemented carbide employing a refractory metal binder and process for producing same

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5130004A (en) * 1974-09-05 1976-03-13 Matsushita Electric Industrial Co Ltd Tenshayoteikopeesutonoseizohoho
JPS5658944A (en) * 1979-10-15 1981-05-22 Seiko Instr & Electronics Ltd Wrist watch case

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1961468A (en) * 1930-01-03 1934-06-05 Richard R Walter Sintered alloy
US2765227A (en) * 1950-12-16 1956-10-02 Sintercast Corp America Titanium carbide composite material
US3552937A (en) * 1968-02-10 1971-01-05 Tokyo Shibaura Electric Co Sintered alloys of a chromium carbide-tungsten carbide-nickel system
US3890105A (en) * 1972-04-27 1975-06-17 Bluecher Wahlstatt Leichtmet Metallic sintering powder or alloy
US3964878A (en) * 1973-06-06 1976-06-22 Gte Sylvania Incorporated Cemented carbide employing a refractory metal binder and process for producing same

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4770701A (en) * 1986-04-30 1988-09-13 The Standard Oil Company Metal-ceramic composites and method of making
US5403374A (en) * 1991-05-31 1995-04-04 Sumitomo Electric Industries, Ltd. Watch exterior parts and manufacturing method thereof
US5901379A (en) * 1997-07-31 1999-05-11 Phild Co., Ltd. Health bands
US6306196B1 (en) * 1999-08-04 2001-10-23 Hitachi Metals, Ltd. Sintered Ti-system material product derived from injection molding of powder material and producing method thereof
US20040231459A1 (en) * 2003-05-20 2004-11-25 Chun Changmin Advanced erosion resistant carbide cermets with superior high temperature corrosion resistance
US7074253B2 (en) * 2003-05-20 2006-07-11 Exxonmobil Research And Engineering Company Advanced erosion resistant carbide cermets with superior high temperature corrosion resistance
US20060162492A1 (en) * 2003-05-20 2006-07-27 Chun Changmin Advanced erosion resistant carbide cermets with superior high temperature corrosion resistance
US7288132B2 (en) * 2003-05-20 2007-10-30 Exxonmobil Research And Engineering Company Advanced erosion resistant carbide cermets with superior high temperature corrosion resistance
US20090129961A1 (en) * 2007-11-15 2009-05-21 Viper Technologies Llc, D.B.A. Thortex, Inc. Metal injection molding methods and feedstocks
US7883662B2 (en) 2007-11-15 2011-02-08 Viper Technologies Metal injection molding methods and feedstocks
US8124187B2 (en) 2009-09-08 2012-02-28 Viper Technologies Methods of forming porous coatings on substrates
US20140162864A1 (en) * 2012-05-09 2014-06-12 Michelene Hall Metal detectible ceramic tooling
US9670101B2 (en) * 2012-05-09 2017-06-06 Thomas Blaszczykiewicz Metal detectible ceramic tooling
US9815743B2 (en) 2012-05-09 2017-11-14 Michelene Hall Metal detectible ceramic material and method for making the same
US10710933B2 (en) 2012-05-09 2020-07-14 Thomas Blaszczykiewicz Cermet body
US10865149B2 (en) 2012-05-09 2020-12-15 Thomas Blaszczykiewicz Metal-detectable plastic material
US11225704B2 (en) 2012-05-09 2022-01-18 Thomas Blaszczykiewicz Cermet body
US11958262B2 (en) 2019-03-28 2024-04-16 Innex Innovative Industries Cermet tooling with a plastic support structure
US12187004B2 (en) 2019-03-28 2025-01-07 Innex Innovative Industries Composite tooling assembly
US12496795B2 (en) 2019-03-28 2025-12-16 Innex Innovative Industries Composite tooling assembly
CN115710666A (zh) * 2022-10-19 2023-02-24 中南大学 一种含碳化铬包覆碳化钛的镍基复合涂层及其制备方法
CN115710666B (zh) * 2022-10-19 2023-12-01 中南大学 一种含碳化铬包覆碳化钛的镍基复合涂层及其制备方法

Also Published As

Publication number Publication date
JPS61106743A (ja) 1986-05-24
CH665224A5 (fr) 1988-04-29

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